Vista is 'more secure' says Gates

Windows Vista is "dramatically more secure than any other operating system released", Microsoft founder Bill Gates has told BBC News.

Mr Gates said the security features in the new operating system were reason enough to upgrade from Windows XP.

Microsoft launched Vista in London, with more than 100m computers predicted to be using it within 12 months.

Mr Gates also defended the pricing of Vista, which is twice as expensive in Europe compared to the US.

The technology leader called the launch a "big day" that would bring a new digital workstyle and lifestyle.

The new operating system (OS) boasts an improved interface and security tools.

Mr Gates said security in Vista would mean it would be "much, much harder" for malicious hackers to attack computers running the operating system. more